Don't throw around accusations like that willy nilly. It causes "propaganda" to become a trivialized term that everyone can just throw at anyone making any statement they don't agree with after 1 minute of consideration.
This book was written by Hans Rosling, a man who was an expert in data analysis and whose mission was to show actual world data to people in fantastic visualizations they could clearly understand. If there's anything that's far removed from propaganda, it's Rosling's data-based approach to what the situation of the world really is.
About house affordability: do you have statistics for that for every country in the world, or you only care about your neck of the woods (which is not what Rosling cared about at all)? But even if that's true, it doesn't contradict the fact that almost every metric, if not every single one, is better today, please don't succumb to the strawman fallacy.
I will leave his quote here, from his Wikipedia entry:
"People often call me an optimist, because I show them the enormous progress they didn't know about. That makes me angry. I'm not an optimist. That makes me sound naive. I'm a very serious "possibilist". That's something I made up. It means someone who neither hopes without reason, nor fears without reason, someone who constantly resists the overdramatic worldview. As a possibilist, I see all this progress, and it fills me with conviction and hope that further progress is possible. This is not optimistic. It is having a clear and reasonable idea about how things are. It is having a worldview that is constructive and useful."